Why hard disk is a magnetic disk?

Answer 1

Common hard disks with read/write heads are magnetic storage.

The newer SSD (solid state drive) hard disks are not magnetic because there are no read/write heads. Solid state means no moving parts.

SSD drives are labeled as such so you know what you are buying.

Answer 2

A hard drive has platters that have a magnetic coating where the information is stored. These are not magnets however. They are coated metal or glass. also, the platter spins at amazingly high speeds that are impossible without the help of magnetic pull.

Answer 3

The surfaces of disks and magnetic tapes are coated with millions of tiny iron particles so that data can be stored onthem. Each of these particles can act as a magnet. The write/read heads of disk drives or tape drives contain electromagnets that generate magnetic fields in the iron on the storage medium as the head passes over the disk or tape. The presence of a magnetic field represents a '1' bit and its absence represents a '0' bit. The data reading process from magnetic disk or tape is reversed. In reading process, no current is flowing through the electromagnetic and read/write heads have no magnetic field. Because the storage medium has a magnetic field but the head does not. The storage medium charges the magnet in the head, which causes a small current to flow through the head in one direction or the other depending on the polarity of the field. The disk or tape drive senses the direction of the flow as the disk or tape passes by the head. In this way data is sent from the read/write head into memory in the form of electric pulses.The information stored in a disk can be read many times without affecting the stored data. So the reading operation is non-destructive. But the writing of new data erases data previously stored at that location of the disk or tape. Magnetic Disk Now-a-days, magnetic disk is commonly used in computers as secondary storage. A magnetic disk is a circular metal or plastic disk coated on both sides with magnetic recording material (ferrous oxide). The data on magnetic disk is recorded as magnetic fields. The data and instructions are accessed directly or randomly. The disk drives are used to write and read data. The data is stored both sides of the disk (i.e. side 0 and side 1), and each side has its own read/ write head. The magnetic disks are available with different types. There are two fundamental types of magnetic disks. i) Floppy disk or interchangeable disk ii) Hard disk or fixed disk The surfaces of disks and magnetic tapes are coated with millions of tiny iron particles so that data can be stored onthem. Each of these particles can act as a magnet. The write/read heads of disk drives or tape drives contain electromagnets that generate magnetic fields in the iron on the storage medium as the head passes over the disk or tape. The presence of a magnetic field represents a '1' bit and its absence represents a '0' bit. The data reading process from magnetic disk or tape is reversed. In reading process, no current is flowing through the electromagnetic and read/write heads have no magnetic field. Because the storage medium has a magnetic field but the head does not. The storage medium charges the magnet in the head, which causes a small current to flow through the head in one direction or the other depending on the polarity of the field. The disk or tape drive senses the direction of the flow as the disk or tape passes by the head. In this way data is sent from the read/write head into memory in the form of electric pulses.The information stored in a disk can be read many times without affecting the stored data. So the reading operation is non-destructive. But the writing of new data erases data previously stored at that location of the disk or tape. Magnetic Disk Now-a-days, magnetic disk is commonly used in computers as secondary storage. A magnetic disk is a circular metal or plastic disk coated on both sides with magnetic recording material (ferrous oxide). The data on magnetic disk is recorded as magnetic fields. The data and instructions are accessed directly or randomly. The disk drives are used to write and read data. The data is stored both sides of the disk (i.e. side 0 and side 1), and each side has its own read/ write head. The magnetic disks are available with different types. There are two fundamental types of magnetic disks. i) Floppy disk or interchangeable disk ii) Hard disk or fixed disk

Answer 4

Let's make it simple! Think of a CD or DVD; they are optical recorded disks. If instead of a plastic coating like the DC or DVD the disk was coated with a VERY thin layer of magnetic material, now you would have a magnetic disk that you could read or write on just like a cassette recorder or a 8-Track recorder.

Now, instead of just 1 magnetic disk you stacked 2 or more magnetic disks vertically and if you place a electric coil between each set of disks to read or write to the disk surfaces; then you would have a magnetic hard drive or what is more commonly referred to as: A HARD DRIVE.

Answer 5

the platters of a hard disk is stored on base of magnet that's why hdd is called as magnetic disk founded by avneet awasthi